CN1218517C - Slotted mode in wireless CDMA systems - Google Patents

Slotted mode in wireless CDMA systems Download PDF

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Publication number
CN1218517C
CN1218517C CN008040583A CN00804058A CN1218517C CN 1218517 C CN1218517 C CN 1218517C CN 008040583 A CN008040583 A CN 008040583A CN 00804058 A CN00804058 A CN 00804058A CN 1218517 C CN1218517 C CN 1218517C
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China
Prior art keywords
spreading factor
time slot
power level
frame
mobile radio
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Expired - Fee Related
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CN008040583A
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Chinese (zh)
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CN1341303A (en
Inventor
A·赫农
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Pendragon wireless limited liability company
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Koninklijke Philips Electronics NV
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/288—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account the usage mode, e.g. hands-free, data transmission, telephone

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A slotted communication mode employed in a wireless code division multiple access (CDMA) communication system includes slotted frames interspersed among normal frames, each slotted frame containing a slot during which a measurement of signal quality of transmission at a different candidate operating frequency is made by the mobile station, a leading frame portion, and a trailing frame portion. In order to mitigate an increase in bit error rate (BER) as a result of use of the slotted mode the spreading factor (SF) of data in the leading and trailing frame portions is set to a value which is greater than that of data in the normal frames. The increase of spreading factor of data in these frame portions may be accompanied by an increase in power level therein, as a further BER mitigating factor.

Description

Slotted mode in the wireless CDMA systems
The present invention relates to the slotted mode in radio honeycomb or Personal Communications Services (PCS) code division multiple access (CDMA) system, wherein idle time slot seems to resemble between the guiding frame part and tail frame part that is clipped in a work frame, or be clipped between the partial frame, and during this time slot by the quality of mobile radio station at candidate's operating frequency measuring-signal, such as the intensity of pilot signal, this candidate's operating frequency is different from current or service frequency.Especially, the present invention relates to guide relatively frame to send the adjusting of parameter with communicating by letter of tail frame part, and the deterioration and/or the call drop that alleviate communication.
Partly describe in detail when Candidate Frequency carries out the one or many visit at EIA/TIA IS 2000.5 2.6.6.2.8.3.3, mobile radio station is concentrated at a candidate frequency search (CFS) and is measured all pilot frequency intensities, this measurement will be carried out following operation: stop at the operations on the service frequency, forward Candidate Frequency to from service frequency, on Candidate Frequency, measure Mean Input Power, turn back to service frequency and restart operations.These inter-frequency measurements are sent to network infrastructure, and the decision that they are used to switch at there.
In radio honeycomb and PCS Personal Communications System, utilize to switch to roam into the scope that another base station covers with the scope that allows mobile radio station to cover from a base station, comprise the successional ability that guarantees conversation.Usually use to switch and make mobile radio station when current base station is transformed into new base station, also may switch another identical base station of communicating by letter with mobile radio station from one group of forward direction and reverse link.
In cdma system, the switching of mobile radio station between the base station promptly can be that soft handover also can be a direct-cut operation, during soft handover, the forward direction and the reverse link of mobile radio station maintenance simultaneously and current base station and new base station between tour, normally in same frequency, and by two identical data of base stations reception; During direct-cut operation, mobile radio station usually at a new frequency and/or new network from current link switchover to new link, and do not have current and new forward direction and reverse link between simultaneous tour.
Known slotted mode is used to provide idle time slot, carries out inter-frequency measurements by mobile radio station during this time slot.Idle time slot usually but be not the duration that must equal a frame, and its lockstep frame part or partial frame, these frames parts or partial frame generally continue the time of field.In order to explain for simplicity, each guides frame part, and the combination of time slot and tail frame part is called as one " time slot frame ", and these time slot frames are dispersed in the normal frames that is called " normally " frame.In these frame parts or the field, prompt character rate R INFOWith instantaneous spreading factor SF=R CHIP/ R INFOKeep identical with in normal frames, wherein, R CHIPIt is constant chip (chip) rate of pseudo noise (PN) extended code.Yet, during time slot in order to help to utilize viterbi decoder to recover owing to lack and export the symbol that causes and lose, transmitted power level in these parts and symbol energy signal to noise ratio correspondingly increase.
But transmitted power level always can not obtain enough raisings, has reached or during near its maximum radiated power, will cause the error rate (BER) to rise such as the power level when mobile radio station.In this case, slotted mode just may produce call drop, thereby makes troubles and inconvenience to the calling party.
The objective of the invention is to reduce the incidence of the call drop of slotted mode in cdma wireless honeycomb and PCS Personal Communications System.Improve power level during utilizing the frame part of a kind of method of replacing or using in addition before and after time slot.
The present invention is based on a kind of like this viewpoint, eliminates during slotted mode or afterwards the danger of high cutting off rate fully, can reduce the increase of BER by the come and go measure of spreading factor of mobile radio station of abundant raising during these frames parts.
Therefore, according to the slotted mode method of the present invention that in radio CDMA communications system, adopts, the slotted mode method comprises the branch time slot frame that intersperses among in the normal frames, each divides the time slot frame to comprise a time slot, the quality that during this time slot, transmits in the candidate operating frequency measurement that is different from service frequency by mobile radio station, the front of this time slot is a guiding frame part, and the back that changes time slot is a tail frame part, it is characterized in that sending the guiding frame of branch time slot frame and the data in the tail frame part at spreading factor, this spreading factor is greater than the spreading factor that preferably doubles data in the normal frames.
During the work frame part of minute time slot frame, such raising spreading factor can be used as the replacement that increases transmitting power or replenishes.
After poring over following detailed in conjunction with the accompanying drawings, other purpose of the present invention, characteristics and advantage will become very clear.
Fig. 1 represents a mobile radio station and a pair of wireless cellular network.
Fig. 2 is the general synoptic diagram of mobile radio station among Fig. 1.
Fig. 3 A, 3B and 3C are respectively in the slot length of a branch time slot frame in the present invention, operating frequency one time diagram, transmitted power-time diagram and spreading factor one time diagram.
At first referring to Fig. 1, represent a mobile radio station 10, be included in when calling out also the wireless coverage area that can roam into second base station 32 from the wireless coverage area of first base station 22 of direct sequence CDMA (DS-CDMA) network 20, second base station can be identical network, another different DS-CDMA network 30 shown in also can being, therefore, can require " between frequency " to switch.This just means that mobile radio station 10 is one group of forward direction being connected of the base station 22 of F1 with operating frequency in the network 20 and has been converted or has transferred to mobile radio station 10 is connected with the base station 32 of operating frequency F2 in the network 30 one group of forward direction and reverse link L2 with reverse link L1.Order is switched decision and is undertaken by network 20, and at first by mobile radio station 10 measure neighbor base station signal quality, this result sends to network 20 by mobile radio station.The sort signal mass measurement comprises inter-frequency measurements, wherein comprises the measurement from the pilot tone of base station 32, and this measurement is to finish during the idle time slot that slotted mode provides.
On the level of detail shown in Figure 1, network 20 and 30 all is a legacy network.In order to illustrate, network 20 is expressed as and comprises two base stations 22,24, controls a base station controller 26 of a plurality of base stations 22,24, a network controller 28 of Control Network 20.Similarly, network 30 also is illustrated as and comprises two base stations 32,34, controls a base station controller 36 of a plurality of base stations 32,34, a network controller 38 of Control Network 20.Two network controllers link to each other with a communication link 40, and each network controller also links to each other with Public Switched Telephone Network 42.
Mobile radio station 10 as shown in Figure 2, on the level of detail of this figure, it also is traditional mobile radio station.Among the figure, mobile radio station can be considered and comprises RF part 50, baseband portion 60 and user interface part 70.RF part 50 comprises an antenna 52, and it is coupled to duplexer 53, receives from power amplifier 54 to launch a RF spread spectrum communications signals by antenna 52, and will be offered the input of low noise amplifier 55 by the RF spread spectrum communications signals that antenna 52 receives.Modulator 56 preferably has zero IF structure (not shown), its receives from the base band spread spectrum communications signals of the baseband portion 60 of encoder 62 with from the RF carrier signal of voltage controlled oscillator or frequency synthesizer 58, and the RF spread spectrum communications signals is offered the input of power amplifier 54.Similarly, demodulator 57 preferably also has zero IF structure (not shown), its receives from the RF spread spectrum communications signals of low noise amplifier 55 outputs with from the RF carrier signal of oscillator or synthesizer, and the base band spread spectrum communications signals is offered the decoder 63 of baseband portion 60.Usually, encoder 62 and decoder 63 are to realize with the digital signal processor (not shown) at least.Except Code And Decode, encoder 62 and decoder 63 also carry out spread spectrum and despreading in known manner respectively, and this mode is used relevant PN sign indicating number sequence on dependent phase.Baseband portion 60 also comprises a microprocessor 64, it can control generator or the frequency of synthesizer 58, controlled encoder 62 and a decoder 63, and Random Access Storage Unit 65 and non-volatile read-only memory unit 66 are easily lost in access, at least a portion is programmable, such as the EEPROM (not shown), it comprises the firmware of formation by the instruction of microprocessor 64 uses, with the call setup that is controlled at the mobile radio station side variety of event relevant with switching, the neighbor base station that is included in different candidate's operating frequencies is measured such as the pilot signal quality of base station 32.
Baseband portion 60 also comprises a modulus (A/D) transducer 67 and a digital to analog converter 68.Digital to analog converter is presented to encoder 62, and is fed by the microphone 72 of user interface part 76, and digital to analog converter 68 is fed by decoder 63 and the loud speaker 74 of fed user interface section 70.
In the cdma wireless cellular system, special in being the standard of the third generation (3G) system development, from current base station 22 to mobile radio station 10 descending or forward link and from mobile radio station 10 to current base station the various transmission parameters of 22 up or reverse link can adapt to the communication mobile radio station and current base station on the basis of a frame one frame.These parameters comprise power level and spreading factor.Spreading factor is R CHIP/ R INFO, R wherein CHIPBe chip (chip) rate of pseudo noise (PN) extended code, R INFOThe is-symbol rate.For the quality of inhibit signal, power level is adapted in the power control loop road usually, and this loop is formed by the interaction between current base station and the mobile radio station.Transmitting power also can adapt to symbol rate, and spreading factor is variable in multiple-rate business, because in order to improve the ability of cdma system, because symbol rate reduces, transmitting power can increase and reduce along with spreading factor.
The same just as previously mentioned, according to the present invention, during the frame part of minute time slot frame live part, BER is from going to by increase during the cdma system slotted mode and increasing from the instantaneous spreading factor of the transmission of mobile radio station basically.The increase of transient transmission power level is followed or is used in the increase of instantaneous spreading factor simultaneously.
Dividing the time slot frame all is to be dispersed in overstepping one's bounds time slot frame or the normal frames with a ratio periodically, so that make each divide the time slot frame that a plurality of normal frames are arranged.Among Fig. 3 A-3C, the sequence of two normal frames NFR, branch time slot frame SFR and two other minute time slot frame SFR has been described, timesharing removes frame SFR and originates in time t1 and end at time t4, cross at interval effective guiding frame part or field LHF between t1 and the t2, cross over idle time slot SLT at interval between t2 and the t3, cross at interval effective tail frame part or field THF between t3 and the t4.The operating frequency that Fig. 3 A further is illustrated in the mobile radio station 10 in the time interval that is crossed over by idle time slot SLT is service frequency F1, and during this period, mobile radio station is with current base station 22 communications.During the SLT of crack, the operating frequency of mobile radio station 10 is switched to Candidate Frequency F2 at one's leisure so that he from base station 32 be tuned on the Candidate Frequency F2, and on this frequency the measurement pilot frequency power level, thereby indicate its signal quality.
In addition, shown in Fig. 3 B, power level remains on level P1 in normal frames NFR.But be illustrated in two replacement schemes during the tail frame THF of the guiding frame LHF of idle time slot SLT front and back.Represent by solid line for one, power level remains on P1 during these frame parts, in this case, whole BER alleviates effect and must produce by increasing spreading factor, and another is illustrated by the broken lines, the instantaneous power electrical level rising is to level P2, and to alleviate effect be owing to this increase to part BER like this.
According to the present invention, replace or during frame partial L HF and THF, increase power level in addition, these at interval in spreading factor SF be increased to SF2 from SF1.Ratio is selected to consider whether can be accompanied by the increase of power level to prevent that BER from increasing by those of ordinary skill between SF2 and the SF1, if then also should consider the ratio of P2 and P1.Using under the environment that increases spreading factor, SF2 is the twice of SF1 at least.Such as, SF1 is 32, SF2 is 64.
Can think that purpose of the present invention reaches.Though the present invention has been described in detail especially, it is also to be understood that, may carry out a lot of improvement within the spirit and scope of the present invention.In explanation, need understand claim:
A) speech " comprises " not get rid of and has other unit (element) or step listed in the claim;
B) do not get rid of during the speech before a unit " " and have a plurality of such unit;
C) any label in the claim does not limit its scope; With
D) several " devices " structure or functional representation that (means) can realize with same hardware element (item) or software.

Claims (6)

1. the slotted mode method in the radio CDMA communications system, wherein when a mobile radio station during just with the services frequency and first base station communication, used branch time slot communication pattern, this pattern comprises branch time slot frame, these minutes, the time slot frame interspersed among in the middle of the normal frames, normal frames comprises the data with first spreading factor and first power level, each divides the time slot frame all to include a time slot, during this time slot, measure the transmission quality of signals different candidate's operating frequency by mobile radio station, this time slot front is a guiding frame part, this time slot back is a tail frame part, guiding frame part and two frames of tail frame part partly comprise the data with second spreading factor and second power level, it is characterized in that second spreading factor is greater than first spreading factor.
2. the method for claim 1 is characterized in that second power level equals first power level.
3. the method for claim 1 is characterized in that second power level is greater than first power level.
4. the method for claim 1 is characterized in that second spreading factor is the twice of first spreading factor at least.
5. method as claimed in claim 2 is characterized in that second spreading factor is the twice of first spreading factor at least.
6. method as claimed in claim 3 is characterized in that second spreading factor is the twice of first spreading factor at least.
CN008040583A 1999-12-22 2000-12-07 Slotted mode in wireless CDMA systems Expired - Fee Related CN1218517C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/459,255 US6501744B1 (en) 1999-12-22 1999-12-22 Slotted mode in wireless CDMA systems
US09/459,255 1999-12-22
US09/459255 1999-12-22

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CN1341303A CN1341303A (en) 2002-03-20
CN1218517C true CN1218517C (en) 2005-09-07

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US (1) US6501744B1 (en)
EP (1) EP1155520B1 (en)
JP (1) JP2003518815A (en)
KR (1) KR20010102268A (en)
CN (1) CN1218517C (en)
DE (1) DE60030958T2 (en)
ES (1) ES2272345T3 (en)
WO (1) WO2001047155A1 (en)

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FI109862B (en) * 2000-01-10 2002-10-15 Nokia Corp Procedure for preparing a handover between frequencies, a network element and a mobile station
KR100592597B1 (en) * 2001-01-10 2006-06-26 한국전자통신연구원 A Method for Handover using Compressed Mode and Common Frequency between Neighbor Cells
US6717931B2 (en) * 2002-01-02 2004-04-06 Nokia Corporation Adaptive spreading factor based on power control
EP1998475B1 (en) * 2006-03-17 2018-01-03 NEC Corporation Transmission power control method and base station
US9596646B2 (en) * 2014-05-08 2017-03-14 Intel IP Corporation Blacklisting techniques for detected set event evaluation

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TW306102B (en) * 1993-06-14 1997-05-21 Ericsson Telefon Ab L M
DE4319830A1 (en) * 1993-06-16 1995-03-09 Philips Patentverwaltung CDMA transmission system
US5594738A (en) * 1993-10-18 1997-01-14 Motorola, Inc. Time slot allocation method
US5491718A (en) * 1994-01-05 1996-02-13 Nokia Mobile Phones Ltd. CDMA radiotelephone having optimized slotted mode and long code operation
EP0868093A1 (en) 1997-03-27 1998-09-30 Motorola, Inc. System and method for managing power budgets
ATE304755T1 (en) 1997-05-02 2005-09-15 Siemens Ag TDMA/CDMA MESSAGE TRANSMISSION SYSTEM WITH ADJUSTABLE DATA RATE
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DE59803477D1 (en) 1998-04-28 2002-04-25 Siemens Ag DATA TRANSFER WITH INTERRUPTION PHASES
US6320855B1 (en) * 1999-09-09 2001-11-20 Qualcom Incorporated Method and system for initiating idle handoff in a wireless communications system

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DE60030958D1 (en) 2006-11-09
WO2001047155A1 (en) 2001-06-28
DE60030958T2 (en) 2007-06-21
CN1341303A (en) 2002-03-20
EP1155520B1 (en) 2006-09-27
EP1155520A1 (en) 2001-11-21
KR20010102268A (en) 2001-11-15
US6501744B1 (en) 2002-12-31
JP2003518815A (en) 2003-06-10
ES2272345T3 (en) 2007-05-01

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